Add CompoundSyncable class for synchronizing containers of Syncables.

blimp/helium/version_vector.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "blimp/helium/version_vector.h"
 
 #include <algorithm>
 
 #include "base/logging.h"
 
 namespace blimp {
 namespace helium {
 
 VersionVector::VersionVector() {}
 
 VersionVector::VersionVector(Revision local_revision, Revision remote_revision)
     : local_revision_(local_revision), remote_revision_(remote_revision) {}
 
 VersionVector::Comparison VersionVector::CompareTo(
     const VersionVector& other) const {
-  DCHECK(local_revision_ >= other.local_revision());
+  DCHECK_GE(local_revision_, other.local_revision());
 
   if (local_revision_ == other.local_revision()) {
     if (remote_revision_ == other.remote_revision()) {
       return VersionVector::Comparison::EqualTo;
     } else if (remote_revision_ < other.remote_revision()) {
       return VersionVector::Comparison::LessThan;
     } else {
       return VersionVector::Comparison::GreaterThan;
     }
   } else {
@@ skipping 30 matching lines @@
   result.set_remote_revision(remote_revision_);
   return result;
 }
 
 VersionVector VersionVector::Invert() const {
   return VersionVector(remote_revision_, local_revision_);
 }
 
 }  // namespace helium
 }  // namespace blimp